143 lines
4.5 KiB
JavaScript
143 lines
4.5 KiB
JavaScript
#// Usage: jjs -scripting gutenberg.js
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/*
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* Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of Oracle nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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// Simple example that demonstrates reading XML Rss feed
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// to generate a HTML file from script and show it by browser
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// Java classes used
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var Characters = Java.type("javax.xml.stream.events.Characters");
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var Factory = Java.type("javax.xml.stream.XMLInputFactory");
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var File = Java.type("java.io.File");
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var FileWriter = Java.type("java.io.FileWriter");
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var PrintWriter = Java.type("java.io.PrintWriter");
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var URL = Java.type("java.net.URL");
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// read Rss feed from a URL. Returns an array
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// of objects having only title and link properties
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function readRssFeed(url) {
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var fac = Factory.newInstance();
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var reader = fac.createXMLEventReader(url.openStream());
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// get text content from next event
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function getChars() {
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var result = "";
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var e = reader.nextEvent();
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if (e instanceof Characters) {
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result = e.getData();
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}
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return result;
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}
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var items = [];
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var title, link;
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var inItem = false;
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while (reader.hasNext()) {
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var evt = reader.nextEvent();
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if (evt.isStartElement()) {
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var local = evt.name.localPart;
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if (local == "item") {
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// capture title, description now
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inItem = true;
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}
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if (inItem) {
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switch (local) {
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case 'title':
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title = getChars();
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break;
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case 'link':
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link = getChars();
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break;
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}
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}
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} else if (evt.isEndElement()) {
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var local = evt.name.localPart;
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if (local == "item") {
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// one item done, save it in result array
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items.push({ title: title, link: link });
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inItem = false;
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}
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}
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}
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return items;
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}
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// generate simple HTML for an RSS feed
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function getBooksHtml() {
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var url = new URL("http://www.gutenberg.org/cache/epub/feeds/today.rss");
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var items = readRssFeed(url);
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var str = "<ul>";
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// Nashorn's string interpolation and heredoc
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// support is very handy in generating text content
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// that is filled with elements from runtime objects.
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// We insert title and link in <li> elements here.
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for each (i in items) {
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str += <<EOF
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<li>
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<a href="${i.link}">${i.title}</a>
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</li>
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EOF
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}
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str += "</ul>";
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return str;
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}
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// write the string to the given file
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function writeTo(file, str) {
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var w = new PrintWriter(new FileWriter(file));
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try {
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w.print(str);
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} finally {
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w.close();
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}
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}
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// generate books HTML
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var str = getBooksHtml();
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// write to file. __DIR__ is directory where
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// this script is stored.
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var file = new File(__DIR__ + "books.html");
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writeTo(file, str);
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// show it by desktop browser
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try {
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var Desktop = Java.type("java.awt.Desktop");
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Desktop.desktop.browse(file.toURI());
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} catch (e) {
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print(e);
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}
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